Commit 946f042d authored by unknown's avatar unknown
Browse files

trx0purge.c: 

  Remove duplicated innodb max purge lag code


innobase/trx/trx0purge.c:
  Remove duplicated innodb max purge lag code
parent 3afd8e79

innobase/trx/trx0purge.c

+0 −24
Original line number Diff line number Diff line
@@ -1069,30 +1069,6 @@ trx_purge(void) 
		}

	}



	/* Determine how much data manipulation language (DML) statements

	need to be delayed in order to reduce the lagging of the purge

	thread. */

	srv_dml_needed_delay = 0; /* in microseconds; default: no delay */



	/* If we cannot advance the 'purge view' because of an old

	'consistent read view', then the DML statements cannot be delayed.

	Also, srv_max_purge_lag <= 0 means 'infinity'. */

	if (srv_max_purge_lag > 0

			&& !UT_LIST_GET_LAST(trx_sys->view_list)) {

		float	ratio = (float) trx_sys->rseg_history_len

				/ srv_max_purge_lag;

		if (ratio > ULINT_MAX / 10000) {

			/* Avoid overflow: maximum delay is 4295 seconds */

			srv_dml_needed_delay = ULINT_MAX;

		} else if (ratio > 1) {

			/* If the history list length exceeds the

			innodb_max_purge_lag, the

			data manipulation statements are delayed

			by at least 5000 microseconds. */

			srv_dml_needed_delay = (ulint) ((ratio - .5) * 10000);

		}

	}



	purge_sys->view = read_view_oldest_copy_or_open_new(NULL,

							purge_sys->heap);

	mutex_exit(&kernel_mutex);